Calcium carbide, CaC2 reacts with water to form acetylene. CaC2(s)+2H2O(l) ==> C2H2(g)+ Ca(OH)2(s) a)how many grams of water are needed to react with...

Calcium carbide, CaC2 reacts with water to form acetylene.
CaC2(s)+2H2O(l) ==> C2H2(g)+ Ca(OH)2(s)
a)how many grams of water are needed to react with 485g of calcium carbide?
b)how many grams of CaC2 could make 23.6g C2H2?
c)If 55.3 g Ca(OH)2 are formed, how many grams of water reacted?